Hinge for folding squares



PATENT OFFICE.

ELIPHALET DE CAMP, NEWARK, NEW JERSEY.

HINGE FOR FOLDING SQUARES.

SPECIFICATION forming part of Letters Patent No. 510,529, dated December12, 1893. 7

Application filed March 16, 1893.

To all whom it may concern.-

Be it known that I, ELIPHALET DE CAMP, a citizen of the United States,residing in Newark, county of Essex, and State of New J ersey, haveinvented certain new and useful Improvements in Hinges for FoldingSquares; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to letters of referencemarked thereon, which form a part of this specification.

This invention relates to new and useful improvements in hingesespecially adapted for the folding square described in my former patent,No. 488,545, of December 27, 1892, and has for its object such aconstruction of hinge, that the arms connected together, when opened,shall present a perfectly flat surface without any portion of said hingeprojecting above said surface.

The invention consists in the improved hinge, its connections with thefolding square and in the combination and arrangement of partshereinafter more fully described and claimed.

Referring to the accompanying drawings, Figure 1 represents a planviewof a folding square provided with my improved hinge. Fig. 2 is anend view of Fig. 1 when the square has been folded together, and Fig. 3

.is a sectional view on the line so of Fig. 1.

In said drawings a and b represent the arms of the square provided withmitered ends (1. Said ends are pivotally joined together by hinge plates0 countersunk into the arms a and b, so that the surfaces of said platea are flush with the surfaces of the arms a and b when the square isopened. The ends of said hinge plates 0 are rounded as clearly shown inFig. 3 of the drawings. The thickness of said hinge plates 0 correspondsto the thickness of the square. Passing parallel to the miter line at ofthe square and through perforations in the ends ofhinge plates 0 and thearms a and b are the pins or pintles 1', adapted with the hinge plates 0to hinge the arms a and 12 together. The arms a and b are provided withan inwardly beveled groove h in which is adapted to slide a locking boltg, the upper surface of which is also flush Serial No. 466,271. (Nomodel.)

with the surface of the square. Said bolt g is adapted to engage, whenthe square is opened the groove h on'both sides-0f the miter lines d andto lock said arms in that position. By preference the length of thegroove his one half longer than the length of the locking bolt 9, andthat portion of the groove which is formed in the surface of one of thearms a or b is at least the same length as that of said locking bolt.

By using my improved hinge the square may be folded on either side andwhen opened, there will be no projections on either surface.

I do not intend to limit myself to the use of the hinge to a foldingsquare as it maybe used for many other articles without departing fromthe spirit of my invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a folding square, a hinge consisting of two or more independenthinge plates having perforated ends, in combination with two pintles,each passing through the perforated ends of the hinge plates and throughthe parts to be hinged together, said hinge plates extending into thesubstance of the hinged parts, substantially as described.

2. In a folding square, a hinge consisting of two or moreindependentplates having perforated ends, in combination with twopintles passing through the perforations in said plates and the parts tobe hinged together,

said hinge plates being let into the parts to be hinged so that theirsurfaces are in the same plane, substantially as described.

3. A folding square consisting of the arms a and b united at theirmitered ends by hinge plates 0, set in said arms and extending on eitherside of the miter line, the surfaces of the hinge plates and of the armsbeing in the same plane, and by two pintles passing through said arms,beneath their surfaces and parallel to the miter line, and through theends of said hinge plates substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this14th day of February, 1893.

ELIPHALET DE CAMP.

Witnesses:

ALFRED GARTNER, WM. D. BELL.

